Exam 11: Mendel and the Gene Idea

Please use the following information to answer the question(s) below. A man who is an achondroplastic dwarf with normal vision marries a color-blind woman of normal height. The man's father was 6 feet tall, and both the woman's parents were of average height. Achondroplastic dwarfism is autosomal dominant, and red-green color blindness is X-linked recessive. -Why did the F1 offspring of Mendel's classic pea cross always look like one of the two parental varieties?

Please use the following information to answer the question(s) below. A man who is an achondroplastic dwarf with normal vision marries a color-blind woman of normal height. The man's father was 6 feet tall, and both the woman's parents were of average height. Achondroplastic dwarfism is autosomal dominant, and red-green color blindness is X-linked recessive. -Black fur in mice (B) is dominant to brown fur (b). Short tails (T) are dominant to long tails (t). What fraction of the progeny of crosses BbTt × BBtt will be expected to have black fur and long tails?

Use the following pedigree (Figure 11.3) for a family in which dark-shaded symbols represent individuals with one of the two major types of colon cancer. Numbers under the symbols are the individual's age at the time of diagnosis. A slash through the symbol indicates that the individual is deceased. Figure 11.3 -From this pedigree, how does this trait seem to be inherited?

Please use the following information to answer the question(s) below. Gene S controls the sharpness of spines in a type of cactus. Cactuses with the dominant allele, S, have sharp spines, whereas homozygous recessive ss cactuses have dull spines. At the same time, a second gene, N, determines whether or not cactuses have spines. Homozygous recessive nn cactuses have no spines at all. -A cross between a true-breeding sharp-spined cactus and a spineless cactus would produce

Please use the following information to answer the question(s) below. A man who is an achondroplastic dwarf with normal vision marries a color-blind woman of normal height. The man's father was 6 feet tall, and both the woman's parents were of average height. Achondroplastic dwarfism is autosomal dominant, and red-green color blindness is X-linked recessive. -Which of the following statements describes the major reason that the individual with the genotype AaBbCCDdEE can make many kinds of gametes?

Please use the following information to answer the question(s) below. Feather color in budgies is determined by two different genes, Y and B, one for pigment on the outside of the feather and one for the inside. YYBB, YyBB, or YYBb is green; yyBB or yyBb is blue; YYbb or Yybb is yellow; and yybb is white. -Two blue budgies were crossed. Over the years, they produced 22 offspring, 5 of which were white. What are the most likely genotypes for the two blue budgies?

Please use the following information to answer the question(s) below. A man who is an achondroplastic dwarf with normal vision marries a color-blind woman of normal height. The man's father was 6 feet tall, and both the woman's parents were of average height. Achondroplastic dwarfism is autosomal dominant, and red-green color blindness is X-linked recessive. -Which of the following is the best description of the addition rule of probability?

Please use the following information to answer the question(s) below. A man who is an achondroplastic dwarf with normal vision marries a color-blind woman of normal height. The man's father was 6 feet tall, and both the woman's parents were of average height. Achondroplastic dwarfism is autosomal dominant, and red-green color blindness is X-linked recessive. -In cattle, roan coat color (mixed red and white hairs) occurs in the heterozygous (CRCr) offspring of red (CRCR) and white (CrCr) homozygotes. Which of the following crosses would produce offspring in the ratio of 1 red:2 roan:1 white?

Please use the following information to answer the question(s) below. A man who is an achondroplastic dwarf with normal vision marries a color-blind woman of normal height. The man's father was 6 feet tall, and both the woman's parents were of average height. Achondroplastic dwarfism is autosomal dominant, and red-green color blindness is X-linked recessive. -Given the following cross between parents of the genotypes AABBCc × AabbCc, assume simple dominance for each trait and independent assortment. What proportion of the progeny will be expected to phenotypically resemble the first parent?

Please use the following information to answer the question(s) below. A woman who has blood type A positive has a daughter who is type O positive and a son who is type B negative. Rh positive is a trait that shows simple dominance over Rh negative and is designated by the alleles R and r, respectively. A third gene for the MN blood group has codominant alleles M and N. -Which of the following is a possible phenotype for the father?

Please use the following information to answer the question(s) below. Tallness (T) in snapdragons is dominant to dwarfness (t), and red (CR) flower color is not dominant to white (Cr). The heterozygous condition results in pink (CRCr) flower color. -If snapdragons are heterozygous for height as well as for flower color, a mating between them will result in what ratio?

Please use the following information to answer the question(s) below. Skin color in a certain species of fish is inherited via a single gene with four different alleles. -How many different types of gametes would be possible in this system?

Please use the following information to answer the question(s) below. Gene S controls the sharpness of spines in a type of cactus. Cactuses with the dominant allele, S, have sharp spines, whereas homozygous recessive ss cactuses have dull spines. At the same time, a second gene, N, determines whether or not cactuses have spines. Homozygous recessive nn cactuses have no spines at all. -If doubly heterozygous SsNn cactuses were allowed to self-pollinate, the F2 would segregate in which of the following ratios?

Please use the following information to answer the question(s) below. A man who is an achondroplastic dwarf with normal vision marries a color-blind woman of normal height. The man's father was 6 feet tall, and both the woman's parents were of average height. Achondroplastic dwarfism is autosomal dominant, and red-green color blindness is X-linked recessive. -Mendel accounted for the observation that traits that had disappeared in the F1 generation reappeared in the F2 generation by proposing that

Please use the following information to answer the question(s) below. Labrador retrievers are black, brown, or yellow. In a cross of a black female with a brown male, results can be all black puppies, 1/2 black to 1/2 brown puppies, or 3/4 black to 1/4 yellow puppies. -In one cross of black × black, the results were as follows: 9/16 black, 4/16 yellow, 3/16 brown The genotype eebb must result in which of the following?

Please use the following information to answer the question(s) below. Two true-breeding stocks of pea plants are crossed. One parent has red axial flowers and the other has white terminal flowers; all F1 individuals have red axial flowers. The genes for flower color and location assort independently. -If 1,000 F2 offspring resulted from the cross, approximately how many of them would you expect to have red terminal flowers?

Please use the following information to answer the question(s) below. A man who is an achondroplastic dwarf with normal vision marries a color-blind woman of normal height. The man's father was 6 feet tall, and both the woman's parents were of average height. Achondroplastic dwarfism is autosomal dominant, and red-green color blindness is X-linked recessive. -Which of the following statements provides an example of epistasis?

Please use the following information to answer the question(s) below. A man who is an achondroplastic dwarf with normal vision marries a color-blind woman of normal height. The man's father was 6 feet tall, and both the woman's parents were of average height. Achondroplastic dwarfism is autosomal dominant, and red-green color blindness is X-linked recessive. -A sexually reproducing animal has two unlinked genes, one for head shape (H) and one for tail length (T). Its genotype is HhTt. Which of the following genotypes is possible in a gamete from this organism?

Please use the following information to answer the question(s) below. Radish flowers may be red, purple, or white. A cross between a red-flowered plant and a white-flowered plant yields all-purple offspring. The part of the radish we eat may be oval or long, with long being the dominant trait. -If true-breeding red long radishes are crossed with true-breeding white oval radishes, the F1 will be expected to be which of the following?

Please use the following information to answer the question(s) below. Figure 11.2 shows a pedigree chart for a family, some of whose members exhibit the dominant trait, W. Affected individuals are indicated by a dark square or circle. Figure 11.2 -What is the likelihood that the offspring of IV-3 and IV-4 will have the trait?